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Ionization Enthalpy

Compare the f...

Question

Compare the first ionization energy of Aluminium (Z=13) with that of Magnesium (Z=12). Justify your answer.

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Solution

The valence shell electronic configuration of $M g$ is $3 s^{2}$
The valence shell electronic configuration of $A l$ is $3 s^{2} 3 p^{1}$
Less energy is required to remove a p electron than $s$ electron. Hence, the first ionization energy of Al is lower than that of Mg

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